As Grant said, Powershell is your friend. 

Start with defining a central db where you'll store all your collected data and tables to store data (redacted for your requirement only)

$SQLSRVR = “xxx”
$DB = “DBA”
$TableServerInfo = “PS.ServerInfo”
$TableDatabaseinfo = "PS.DatabaseInfo"
$TableDiskSpace = "PS.DiskSpaceInfo"

Then define the connection to each server you'll collect::

$SQLCON = New-Object System.Data.SqlClient.SqlConnection("Data Source=$SQLSRVR;Initial Catalog=$DB;Integrated Security=SSPI")
$SQLCON.open()
$SQL = $SQLCON.CreateCommand()

and where the script should find your server list:

ForEach ($instance in Get-Content "C:\PS\servers.txt") #change the directory to where your site list is stored
{
[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO')
$s = New-Object ('Microsoft.SqlServer.Management.Smo.Server') $instance

Define query spaces:

$dbs=$s.Information
$db=$s.Databases
$res = $instance.split('\')[0]

Then define your queries as you need the information from SQL:

$DatabaseServerInfo = $dbs | Select Parent, FullyQualifiedNetName, Physicalmemory, Processors, PlatForm, NetName, OSVersion, language, Edition, Version, BuildNumber, Collation, IsClustered, IsHADREnabled, IsSingleUser, Get-Date
$DatabaseInfo   = $db | select Parent, Name, Size, AvailabilityDatabaseSynchronizationState, CompatibilityLevel, DataSpaceUsage, SpaceAvailable, IndexSpaceUsage, IsAccessible, IsUpdateable, RecoveryModel, LastBackupDate, LastLogBackupDate, MirroringStatus, Owner, ReadOnly, Get-Date, CreateDate
$DiskSpaceInfo  =   Get-WmiObject win32_logicaldisk -computername $instance.Split('\')[0] | Where-Object { $_.DriveType -eq 3 } | Select-Object SystemName,Name, DeviceID, Size, FreeSpace

Insert statements from each query into your predefined tables:

Foreach($DatabaseServer in $DatabaseServerInfo)
{
  $Parent = $DatabaseServer.parent
  $FullyQualifiedNetName = $DatabaseServer.FullyQualifiedNetName
  $PhysicalMemory = $DatabaseServer.PhysicalMemory
  $Processors = $DatabaseServer.Processors
  $Platform = $DatabaseServer.Platform
  $NetName = $DatabaseServer.NetName
  $OSVersion = $DatabaseServer.OSVersion 
  $language = $DatabaseServer.language
  $Edition = $DatabaseServer.Edition
  $BuildNumber = $DatabaseServer.BuildNumber
  $Collation = $DatabaseServer.Collation
  $IsClustered = $DatabaseServer.IsClustered
  $IsHADREnabled = $DatabaseServer.IsHADREnabled
  $DateUpdated = Get-Date
  $Version = $DatabaseServer.Version
  $IsSingleUser = $DatabaseServer.IsSingleUser
 
  
  $SQLupdate = "Insert into $TableServerInfo values ('$Parent', '$FullyQualifiedNetName', '$PhysicalMemory', '$Processors', '$Platform',
  '$NetName', '$OSVersion', '$language', '$Edition','$Version', '$BuildNumber', '$Collation', '$IsClustered', '$IsHADREnabled', '$IsSingleUser', '$DateUpdated')"
  Write-host $SQLupdate
  $SQL.CommandText = $SQLupdate
  $SQL.ExecuteNonQuery() > $null
}

Just posting sample code, but this should at least get you started, this is not perfect by any means, so feel free to modify and improve.